Is it shrapnel or shrap metal?
Excuse me, but I couldn't help but notice the terminology used in your question. Are you referring to the fragments of metal, often from exploded munitions, that are known colloquially as "shrapnel"? And are you perhaps wondering if there's a misnomer, such as "shrap metal," that you've encountered? Just to clarify, the correct term is indeed "shrapnel," which refers to the fragments of metal that are propelled by an explosion. Is there any specific reason why you're asking, or is this purely out of curiosity?